Sharp CD-PC1881V Service Manual page 45

IC1 VHiLA9241M/-1:Servo Amp.(LA9241M) (2/2)
Port Name
Pin No.
51 CL
52 DAT
53 CE
54 DRF
55 FSS
56 VCC2
57 REF1
58 VR
59 LF2
60 PHI
61 BHI
62 LDO
63 LDS
64 VCC1
VCC1
LDS
64 63
1
FIN2
FIN1
2
I/V
E 3
F
4
TB 5
TE- 6
TE 7
TESI 8
SCI
9
T.SERVO & T.LOGIC
TH
10
TA
11
TD-
12
TD
13
14
JP
TO
15
FD
16
Micro computer command clock input pin.
Micro computer command data input pin.
Micro computer command chip enable input pin.
(DETECT RF) RF level detection output.
(Focus Serch Select) Pin to switch focus search mode. (± search/+ search for reference voltage)
VCC pin for servo system and digital system.
Pin to connect pass control for reference voltage.
Reference voltage output pin.
Pin to set defect detection time constant of disk.
Pin to connect capacitor for peak hold of RF signal.
Pin to connect capacitor for bottom hold of RF signal.
APC circuit output pin.
APC circuit output pin.
RF system VCC pin.
LDO
BHI PHI
62 61 60
APC
RF DET
VCA
BAL VCA
TE
F.SERVO & F.LOGIC
17 18 19
FA FA-
FD-
Figure 45 BLOCK DIAGRAM OF IC
Function
LF2 VR REF1 VCC2
FSS
56
59 58 57
REF
µ-COM
INTER FACE
SPINDLE SERVO
AGND
20 21 22 23 24 25 26
FE FE- SP SPI SPG SP-
– 45 –
CD-PC1881V
CL CLK
DRF CE DAT DEF
54 53 52 51 50
55
SLC
RF AMP
SLED SERVO
27 28 29 30 31
SPO SLEO SLO SL- SL+
49
48
NC
47 TBC
FSC
46
DGND
45
44
SLI
43 SLC
42
RFS-
41
RFSM
40 CV+
CV-
39
38 SLOF
37
HFL
36
TES
35
TOFF
34
TGL
33
JP+
32
JP-